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1. Remove two guide bar nuts and remove sprocket guard. 2. Remove three muffler cover screws and remove muffler cover. 3. Remove spark arrestor screen cover, gaskets, and screen from 4. muffler body. Clean carbon deposits from muffler components.5. Replace screen if it is cracked, plugged, or has holes burned through. 6. Assemble components in reverse order. 7. NOTE: When cleaning carbon deposit, be careful not to damage the catalytic element inside muffler. Cylinder Exhaust Port IMPORTANT : The